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Spanish player Rafael Nadal returns the ball to Serbian player Novak Djokovic during the men's single final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on July 3, 2011.

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Serbian player Novak Djokovic serves to Spanish player Rafael Nadal during the men's single final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on July 3, 2011.

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Serbia's Novak Djokovic dives for a return shot to Spain's Rafael Nadal during the men's singles final at the All England Lawn Tennis Championships at Wimbledon, Sunday, July 3, 2011.

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A spectator with a Serbian flag on her cheek gestures as she watches the final between Spanish player Rafael Nadal and Serbian player Novak Djokovic at a giant screen at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on July 3, 2011.

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Spanish player Rafael Nadal returns the ball to Serbian player Novak Djokovic during the men's single final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on July 3, 2011.

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Novak Djokovic of Serbia returns a shot during his final round Gentlemen's match against Rafael Nadal of Spain on Day Thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2011 in London, England.

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Serbian player Novak Djokovic returns the ball to Spanish player Rafael Nadal during the men's single final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on July 3, 2011.

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Novak Djokovic of Serbia celebrates championship point after winning his final round Gentlemen's match against Rafael Nadal of Spain on Day Thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2011 in London, England. Djokovic beat the defending champion Rafael Nadal 6-4, 6-1, 1-6, 6-3.

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Winner Novak Djokovic of Serbia and runner-up Rafael Nadal of Spain with their trophies after their final round Gentlemen's match on Day Thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2011 in London, England.

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Serbian player Novak Djokovic kisses the trophy after beating Spanish player Rafael Nadal in the men's single final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on July 3, 2011. It was his first Wimbledon men's final title.

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Irina Khromacheva of Russia returns a shot during her final round Girls' match against Ashleigh Barty of Australia on Day Thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2011 in London, England.

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Ashleigh Barty of Australia kisses her trophy after winning her final round Girls' match against Irina Khromacheva of Russia on Day Thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2011 in London, England.

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Russia's Maria Sharapova serves to Petra Kvitova of the Czech Republic during the ladies' singles final at the All England Lawn Tennis Championships at Wimbledon, Saturday, July 2, 2011.

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Petra Kvitova of the Czech Republic returns a shot to Russia's Maria Sharapova during the ladies' singles final at the All England Lawn Tennis Championships at Wimbledon, Saturday, July 2, 2011.

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Petra Kvitova of the Czech Republic returns a shot to Russia's Maria Sharapova during the ladies' singles final at the All England Lawn Tennis Championships at Wimbledon, Saturday, July 2, 2011.

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Petra Kvitova of the Czech Republic holds her trophy after defeating Russia's Maria Sharapova in the ladies' singles final at the All England Lawn Tennis Championships at Wimbledon, Saturday, July 2, 2011. Kvitova won her first Grand Slam title by beating Sharapova 6-3, 6-4.

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Russia's Maria Sharapova looks at her runner-up trophy after being defeated by Petra Kvitova of the Czech Republic in the ladies' singles final at the All England Lawn Tennis Championships at Wimbledon, Saturday, July 2, 2011.

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Australia's Luke Saville holds up the trophy after winning the boys' singles final match against Britain's Liam Broady at the All England Lawn Tennis Championships at Wimbledon, Saturday, July 2, 2011.

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Japan's Shingo Kunieda returns a ball during his wheelchair doubles match with partner Tom Egberink of the Netherlands to France's Stephane Houdet and Michael Jeremiasz at the All England Lawn Tennis Championships at Wimbledon, Saturday, July 2, 2011.

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Rafael Nadal of Spain in action during his semifinal round match against Andy Murray of Great Britain on Day Eleven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2011 in London, England.

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Fans of British player Andy Murray react after he lost the semifinal to Spanish player Rafael Nadal at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on July 1, 2011.

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French player Jo-Wilfried Tsonga falls as he plays with Serbian player Novak Djokovic during the men's single semi final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on July 1, 2011. Djokovic defeated Tsonga 7-6 (4), 6-2, 6-7 (9), 6-3.

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Russian player Maria Sharapova returns the ball to German player Sabine Lisicki during the women's semi final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 30, 2011.

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Maria Sharapova of Russia in action during her semifinal round match against Sabine Lisicki of Germany on Day Ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 30, 2011 in London, England.

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Sabine Lisicki of Germany reaches for a shot during her semifinal round match against Maria Sharapova of Russia on Day Ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 30, 2011 in London, England.

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Russian player Maria Sharapova blows a kiss after beating German player Sabine Lisicki during the women's semi final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 30, 2011. Sharapova won 6-4, 6-3.

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Czech player Petra Kvitova (right) reacts after beating Victoria Azarenka of Belarus during the women's semi final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 30, 2011.

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Jie Zheng (left) and Shuai Peng of China in action during their double's match against Kveta Peschke of Czech Republic and Katarina Srebotnik of Slovenia on Day Ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 30, 2011 in London, England.

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Liam Broady of Great Britain in action during his quarterfinal round match against Robin Kern of Germany on Day Ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 30, 2011 in London, England.

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Liam Broady of Great Britain celebrates match point after winning his quarterfinal round match against Robin Kern of Germany on Day Ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 30, 2011 in London, England.

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Tennis fans watch Andy Murray of Great Britain practice on Day Ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 30, 2011 in London, England.

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Rafael Nadal of Spain practices on Day Ten of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club, June 30, 2011 in London, England.

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Roger Federer of Switzerland serves during his quarterfinal round match against Jo-Wilfried Tsonga of France on Day Nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 29, 2011 in London, England.

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French player Jo-Wilfried Tsonga reacts after beating Swiss player Roger Federer during the men's single quarter final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 29, 2011. Tsonga won 3-6, 6-7 (3/7), 6-4, 6-4, 6-4.

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Pippa Middleton and Alex Loudon attend the quarterfinal round match between Roger Federer and Jo-Wilfried Tsonga of France on Day Nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 29, 2011 in London, England.

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British player Andy Murray returns the ball to Spanish player Feliciano Lopez during the men's single quarter final at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 29, 2011.

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French player Marion Bartoli returns the ball to German player Sabine Lisicki during women's quarter final during the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 28, 2011.

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German player Sabine Lisicki reacts after a point over French player Marion Bartoli during the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 28, 2011. Lisicki defeated Bartoli, 6-4, 6-7 (4), 6-1

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Fans wear rain gear before the cover goes on center court as rain delays play on Day Eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 28, 2011 in London, England.

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Paul Hanley of Australia (left) and Simon Aspelin of Sweden in action during their third round double's match against Bob Bryan and Mike Bryan of the United States on Day Eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 28, 2011 in London, England.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the fourth round match between Andy Murray of Great Britain and Richard Gasquet of France on Day Seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2011 in London, England.

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Andy Murray of Great Britain bows after winning his fourth round match against Richard Gasquet of France, on Day Seven of the Wimbledon Lawn Tennis Championships, June 27, 2011, in London.

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Venus Williams of the United States plays against Bulgaria's Tsvetana Pironkova in a Women's Singles match at the 2011 Wimbledon Tennis Championships at the All England Tennis Club, in south-west London, on June 27, 2011. Pironkova defeated Williams, 6-2, 6-3.

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Michael Llodra of France in action during his fourth round match against Novak Djokovic of Serbia on Day Seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2011 in London, England. Djokovic, the number two seed, beat Llodra, 6-3, 6-3, 6-3.

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American player Mardy Fish reacts after beating Czech player Thomas Berdych during the men's single at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 27, 2011.

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French player Marion Bartoli returns the ball to Serena Williams during their match, June 27, 2011.

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Serena Williams leaves the court after losing to French player Marion Bartoli during the women's single at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 27, 2011. Bartoli won 6-3, 7-6 (6).

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Maria Sharapova of Russia serves during her third round match against Klara Zakopalova of the Czech Republic on Day Six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 25, 2011 in London, England. The 2004 champion Sharapova won in straights set to reach the round of 16.

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Austria's Tamira Paszek returns a ball to Italy's Francesca Schiavone during their match at the All England Lawn Tennis Championships at Wimbledon, Saturday, June 25, 2011.

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Switzerland's Roger Federer returns a shot to Argentina's David Nalbandian during their match at the All England Lawn Tennis Championships at Wimbledon, Saturday, June 25, 2011. Federer, a six-time champion, beat Nalbandian 6-4, 6-2, 6-4 to move closer to equaling Pete Sampras' record of seven Wimbledon titles.

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Petra Cetkovska of the Czech Republic works on her racket during her third round match against Ana Ivanovic of Serbiain, June 25, 2011 in London, England.

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American player Serena Williams serves to Russia's Maria Kirilenko during the women's single at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 25, 2011.

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Serena Williams of the United States falls during her third-round match against Maria Kirilenko of Russia on Day Six of the Wimbledon Lawn Tennis Championships June 25, 2011 in London.

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Russian Maria Kirilenko serves to Serena Williams of the U.S. during the women's single at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 25, 2011.

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Serena Williams reacts as she plays against Maria Kirilenko during the women's single at the Wimbledon Tennis Championships at the All England Tennis Club, in southwest London on June 25, 2011. Williams reached the fourth round at Wimbledon by beating 26th-seeded Kirilenko 6-3, 6-2 with the help of 10 aces. It was the four-time champion's first straight-set victory in five matches since she returned this month after being away from the tour for nearly a year because of a series of health scares, including blood clots in her lungs.

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In a match that had been suspended after the first set because of darkness Friday, Spanish player Rafael Nadal hit 36 winners and never lost serve to defeat the 92nd-ranked wild card from Luxembourg Gilles Muller 7-6 (6), 7-6 (5), 6-0, during the men's singles at the Wimbledon Tennis Championships, Saturday, June 25, 2011.

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The BBC Television edit suite showing all the tennis courts is pictured on the sixth day of the 2011 Wimbledon Tennis Championships at the All England Tennis Club, in south-west London, June 25, 2011.

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Spain's David Ferrer returns a shot to Slovakia's Karol Beck during their match at the All England Lawn Tennis Championships at Wimbledon, Saturday, June 25, 2011.

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Venus Williams of the U.S. celebrates defeating Spain's Maria Jose Martinez Sanchez at the All England Lawn Tennis Championships at Wimbledon, Friday, June 24, 2011.

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Andy Roddick of the U.S. plays against Spain's Feliciano Lopez in a Men's Singles match at the 2011 Wimbledon Tennis Championships at the All England Tennis Club, in southwest London, June 24, 2011. Roddick, a three-time runner-up at the All England Club, came up short in the third round, beaten 7-6 (2), 7-6 (2), 6-4 by the unseeded Lopez. At No. 8, the 28-year-old Roddick is the highest-seeded man out of the tournament so far.

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Spain's Rafael Nadal reacts after defeating American Ryan Sweeting at the All England Lawn Tennis Championships at Wimbledon, June 22, 2011.

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Czech Republic's Tomas Berdych falls to the ground during his match against France's Julien Benneteau at the All England Lawn Tennis Championships at Wimbledon, June 22, 2011.

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Bethanie Mattek-Sands of the U.S. in action against Japan's Misaki Doi at the All England Lawn Tennis Championships at Wimbledon, June 22, 2011.

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Robin Haase of the Netherlands celebrates after defeating Spain's Fernando Verdasco at the All England Lawn Tennis Championships at Wimbledon, June 22, 2011.

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Andy Roddick of the U.S. reacts after defeating Romania's Victor Hanescu in their match at the All England Lawn Tennis Championships at Wimbledon, June 22, 2011.

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Maria Sharapova in action during the first round match against fellow Russian Anna Chakvetadze at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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American Bethanie Mattek-Sands arrives on court prior to her match against Japan's Misaki Doi at the All England Lawn Tennis Championships at Wimbledon, June 22, 2011.

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France's Nicolas Mahut in action during the first round match against American John Isner at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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Switzerland's Roger Federer returns a shot to Kazakhstan's Mikhail Kukushkin at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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Slovakia's Daniela Hantuchova in action during the match against Russia's Vitalia Diatchenko at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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Serena Williams of the U.S. reacts after defeating France's Aravane Rezai in their first round match at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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Marcos Baghdatis of Cyprus makes a forehand return to James Blake of the U.S. during their first round match at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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Argentina's Juan Martin Del Potro makes a backhand return during his first round match against Italy's Flavio Cipolla at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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Spain's Rafael Nadal in action during his first round match against Michael Russell of the U.S. at the All England Lawn Tennis Championships at Wimbledon, June, 20, 2011.

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The rain covers are pulled over the court as the roof is closed on Centre Court on the first day of the All England Lawn Tennis Championships at Wimbledon, June 20, 2011.

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Serena Williams of the US reacts during the match against France's Aravane Rezai at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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Slovakia's Karol Beck and Argentina's Carlos Berlocq in action at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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Andy Roddick of the U.S. in action during his first round match against Germany's Andreas Beck at the All England Lawn Tennis Championships at Wimbledon, June 21, 2011.

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Spain's Rafael Nadal in action during his first round match against Michael Russell of the U.S. at the All England Lawn Tennis Championships at Wimbledon, June 20, 2011.

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Venus Williams of the U.S. returns a shot to Uzbekistan's Akgul Amanmuradova at the All England Lawn Tennis Championships at Wimbledon, June 20, 2011.